Improvement in guides for rotary rock-drills



A.4 BALL. Y Guides for Rutary Rock-Drills. 510.134,50.

ALBERT BALL, OF CLAREMONT, NEIV HAMPSHIRE, ASSIGNR TO SULLIVAN MACHINECOMPANY, OF SAME lPLACE.

IMPRQVEMENT IN GUIDES FOR ROTARY ROCK-DRILLS.

Specification forming part of Letters Patent No. HSL-506, dated January7, 1873.

To all who-m yit may concern:

Beitl known that I, ALBERT BALL, of the town of Claremont, county ofSullivan and State of New Hampshire, have invented certain Improvementsin Guides for Rotary Roek- Drills; and Ideclare the following` to beafull and exact description thereof.

My invention consists, irst, in a device for holding a rotating drillhead or bit while at work to a direct line of operation, at a uniformdistance from a hole already bored, second, in a device combined withdrill and guide for cutting or breaking a narrow wall or web leftbetween two holes while the second hole is being bored; third, in adevice for holding the guide iu position until its use as a guidebegins.

rIhe attempt has hitherto been made to use a drillguide, operatingwithin a hole already bored; but suoli guides have not proved ofpractical value, because the guide has been attached to a drill head orbit which, in boring the second hole, directly intercommunicated with orintercut the hole already bored or the guidinghole. In such case thedrill head or bit when at work is only partially employed, and is notsupported on all sides by the wall of the rock or material into which itis fed, and for these reasons the bit or head will soon so tend or runtoward the hole already bored as to bind and to interfere with thesuccessful working of the drill. rIhis tendency is wholly obviated by myimprovement, and the efficiency of such drills for ohanuel-eutting ismaterially increased.

In the drawing filed herewith, Figure l represents a vertical section ofsolid diamonds drill head, 85e., with my improvements, Fig. 2, an endview of solid diamond-drill head with my improvements; Fig. 3. avertical section of guide sleeve or collar; Fig. 4, end view of guidesleeve or collar, Fig. 5, a series of holes bored in rook or marble.

In the drawing the same letters represent corresponding parts of thedevices referred to.

A is the guide'sleeve, B, drill-shank; O,

' waterway; N, coupling to attach drill-shank to drill-rod5 P, drill-rodthreaded to attach to coupling; r, frictionring between guideeollar andcouplingnut; o o', waterways to lubricate between shank and guide collaror sleeve; ff, guide-flanges; s, cutter to break or out out web of stoneor marble; A', metallic web to support guide-flaugesff; S, slot toreceive the braced web of guide-flanges, and to hold the same inposition until the guide-flanges enter the guiding-hole; a a, diamond orother cutting or attriting surfaces 5 w w, water-ways through drill heador bit.

lWIy devices may be attached to any of the wellknown rotating drillswhere it is desired to drill ahole near to a'hole already bored, or tomake a channel cut to best advantage by boring a series of holes. Forexample, we will suppose that the hole e, in Fig. 5, has already beenbored, as there indicated, without the use of the guide. The drillshould now be adjusted for boring the hole d, so as to lea-ve a wall orweb between the holes cV and d. The guide is not necessary in beginningto bore the hole d, and the guide collar or sleeve A is adjusted to holdthe guideiianges ff in position, so that they sha-ll be fed into thehole e when the drill-head has made a little progress into the materialto be bored. The fianges ff are now fed forward into e, leaving theguide sleeve or collar A at the surface ot' the rock. The cutter S isfedl downward with' the guide-Hanges f f, and breaks down the narrow webor wall between cl and c, above the drill-head, when the wall or web hasceased to be of use in supporting or guiding the drill-head. It isobvious that the guide-Harige more remote from the drillhead willaid'the wall of the hole d in resisting any tendency ot' the drill-headto run toward the hole c, and that the guide-iiange nearer to thedrill-head resists any tendency of the drill-head to run from the holee, and that in boring each hole full work is obtained from thedrill-head.

I prefer to make the iianges ff and the connecting-web A as they appearin the drawing, to obviate unnecessary friction, and to leave amplespace for the removal of the dust and detritus produced by working thedrill. The length of the cutter S must vary as the material to be boredvaries in hardness or softness, or in fmeness or coa-rseness, of grain.

#What I claim as my invention, and desire to secure by Letters Patent,is-

l. The combination of the cutter S with arotary drill bit or head and 2Ldrillguide, snb- 11a-tion with the drill-guide m1.ddrill-head,sul

stantially as desoribe, and for the purpose stanially as described. setforth.

2. The combination of the flanges j' f, the web Af, and a drill head orbit, substantially '*itnessess as described, and for the purposessetforth. R. W. LOVE,

ALBERT BALL.

3. The guide sleeve or collar A, in eombi- XV. H. FIGGIs.

